(Reuters) - The gunman who killed one doctor and wounded
another before taking his own life at a Nevada urology office
last week had been a patient there, and investigators are
examining reports he had complained of suffering from a botched
vasectomy, police said on Tuesday.

Police said they were still trying to determine what led
Alan Frazier, 51, a former power plant control room operator
from Northern California, to walk into the office of the Urology
Nevada medical group in Reno last Tuesday and open fire with a
12-gauge shotgun.

One physician with the practice, Charles Gholdoian, was
slain, and another, Christine Lajeunesse, was wounded, along
with a patient, before Frazier shot himself to death. He also
was found to have been carrying two handguns that he apparently
never fired during the attack.

Two days later, Reno police told reporters that Frazier had
left a suicide note indicating he had singled out that doctor's
office for attack. They had learned Frazier had undergone some
unspecified surgery in 2010 that he claimed had left him with
"adverse symptoms."

Police released new details on Tuesday, a week after the
shooting, in response to questions posed by the Associated
Press, revealing that Frazier had been a Urology Nevada patient,
although investigators had yet to determine whether either
doctor he shot had treated him.

Police also confirmed that they were "actively looking into"
a report in the Reno Gazette-Journal newspaper that in 2012
Frazier had posted a number of messages in a Yahoo online chat
room called Vasectomy Pain.

In it, according to the newspaper, Frazier said he was
suffering from post-surgical complications, including severe
joint pain, body aches, fatigue and other symptoms that left him
feeling "like I got run over by a truck."

And according to the Gazette-Journal, Frazier blamed his
doctors, saying, "Yes, yet another victim of an inhumane medical
procedure from hell." The newspaper said Frazier later wrote:
"They need to go down ..."

The idea that Frazier was upset about supposed complications
from a vasectomy gained greater credence from the release on
Tuesday of a batch of recordings of emergency-911 calls from the
shooting incident.

In one of them, a man seeking cover with several other
people in a restroom tells an emergency dispatcher that he
overheard the suspect stating that he was angry at having "had a
vasectomy here and it ruined his life."

"He said, 'As long as you're a patient, you can leave,
otherwise I'm gonna shoot you,'" the man said on the call in
hushed tones.

Other callers are heard whispering frantically over the
phone to 911 operators as they huddled under desks or behind
tables inside interior offices or exam rooms on the third-floor
suite as they heard gunshots going off nearby.

Police have said Frazier had no prior criminal background,
but they were still digging into his medical history, including
his mental health.

Police also have said they were interviewing Frazier's
former fiancee, Stephanie Wright-West, who was quoted by the
Associated Press as saying he had taken medication for
depression and that co-workers once talked him out of trying to
kill himself when they found him in the mountains with a gun in
his truck.